“Chat up”: phrasal verb meaning.

Chat up
Start talking with someone because you like this person and you would like him/her to become your boyfriend/girlfriend. The conversation is not about anything important because the goal of it is to show the other person that you like him/her and probably you want to be his/her boyfriend/girlfriend.

Other examples of “chat up” phrasal verb in a sentence

  • He always chats up girls in the clubs.
  • She was chatting him up all evening.
  • I hate it when strangers chat me up.

“Chat up”: use in context explanation

The girls at at the disco having fun. Suddenly, a guy approaches Jane and tries to chat her up. He clearly likes her a lot but the girl doesn’t look interested. The girls know their friend wants to get out of this embarrassing situation and they have to help her.